Grinding Concrete

InterlockPavers

Hey guys we recently poured a slab around a pool a week ago. However it turns out that we have a high spot that is holding water. I am wondering if anyone has ever grinded concrete before and what wo watch out for.

Any help would be great

Thanks

Tscarborough

High spots generally shed water. Are you going to surface the deck, or is what you have going to be the finished product.

InterlockPavers

Thanks for the reply

Well see the thing is that the is a high spot in the area and direction that the slope should be so it is holding onto some water here.

We intend after grinding on putting some sort of coating on it.

If anyone can help with what to expect that would be a lot of help


Thanks again

Teetorbilt

If you have the room, build with self leveling concrete, Grinding is a mess.

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asbestos

grinding will be messy, the problem will be blending what was ground into what was not. The grit disks they sell everywhere work well. But Serious dust. Major dust, huge. You may be able to get one of those terrazo grinding machines at the rental yard.
Or you could cut around it, bush/chip out to a good depth. then repour.

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kapena

It depends on how much material you need to remove. If it is not too much, you should carefully mark out where the problem is. I then use a diamond blade in a skilsaw set to about 3/8 inch depth and start cutting lines about 3/4 inch apart. After making a bunch of parrallel lines in the marked out area, I use cold chisels and even a wide brick chisel to break out the concrete between the cuts. A lot of the bulk material is removed that way. I then use a Bosch 5" concrete surfacing grinder (1773ak) with a vaccuum. That tool is pretty effective if you are careful. Repeat where necessary. If you over-do it, there are products that you can use to blend everything back into the rest of the slab. It is a messy job. I sometimes use water, rubber boots, and a GFCI with the saw-cutting part to keep the dust down.

jvcstone

Also, if it is not too big of an area, Makita makes a pretty nifty "concrete Planer" . It will take your high spot down, and it comes with a dust collecting bag, (like on a belt sander) to help cut down on the mess. The cutting tool is a 4 inch diamond cup wheel.
JVC

Link http://www.mytoolstore.com/makita/mak05-04.html

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tkle

Some sort of coating?

InterlockPavers

thanks guys i appreciate all the help and information you are giving me here.

I must say this forum is a great place for all contractors.

Some sort of coating? YEa I was gonna coat the whole entire patio surface with a product that will hide some discrepencys. This is the first concrete job we did. It wasnt the worst nor the best. But I just wanna make the homeowner as happy as possible.

Thanks again guys.

Any other suggestions are greatly appreciated.

tkle

Then I would tear it out and do it right.I'm sorry.but grinding it down and using some kind of coating?I thought you were the homeowner.

InterlockPavers

No I m not the homeowner. However this was done for a friend and was very low cost. We were just trying to figure an easy fix if possible. We grinded and left them with nice smooth slab. Rented concrete grinder.

Worked woners but it took time.

Thanks for all your help

tkle

I'm glad it worked for you,but I picture a slick pad with aggregate showing.Am I wrong?